Guided 941-metre route along the Travessia do Vale de Alcântara (Alcântara Valley Crossing). Come and discover the importance this hydraulic infrastructure, built in the 18th century, had for the growth and development of the city of Lisbon. Visits on the following days: 19 July: 2:30 pm, 4:00 pm | 2, 29 August: 10:00 am; 2, 22, 29 August: 11:30 am | 6 September: 2:30 pm, 6 September: 4:00 pm, 26 September: 10:00 am, 26 September: 11:30 am | 11 October: 2:30 pm, 11 October: 4:00 pm, 24 October: 10:00 am, 24 October: 11:30 am | 8 November: 10:00 am, 8 November: 11:30 am. Meeting point: Calçada da Quintinha, no. 6, Campolide. €6 - ticketline.sapo.pt. +6.